Ember ember-views.render-double-modify弃用

Question

我试图消除我最近在我的代码中引入的弃用,我需要一些帮助.

弃用是:

您在单个渲染中修改了两次... 这在Ember 1.x中是不可靠的,将在Ember 2.0中删除[弃用ID:ember-views.render-double-modify]

我要做的是显示一个分数列表,然后显示总分.我需要降低最低分,而不是将其包含在计算总数中.我有这个工作.当我尝试通过classNameBindings将CSS类添加到已排除的分数时,就会弃用.

我很确定当我在computedTotal的计算属性中执行Ember.set时会发生这种情况.

我的问题是,当我在表单中更改分数时,如何更新CSS的总分更新？

代码细节:我有两个组件; 得分排和判断排.分数行包含一系列分数对象,循环通过每个分数调用法官分数组件.

Ember      : 2.2.0
Ember Data : 2.2.1

更新这里有一个工作的Ember Twiddle演示了这个问题:

https://ember-twiddle.com/6696d907b604aa750201?numColumns=1

index.js - (针对此问题提取的模拟代码)

let scores = new Ember A();
scores.pushObject(Ember.Object.create({ points: 1 }));
scores.pushObject(Ember.Object.create({ points: 2 }));
scores.pushObject(Ember.Object.create({ points: 3 }));

index.hbs

{{score-row scores=scores}}

记分row.hbs

{{#each scores as |score|}}
    {{judge-score score=score}}
{{/each}}

{{calculatedTotal}}

记分row.js:

calculatedTotal: Ember.computed('scores.@each.points', () => {
    let totalScore = 0,
        scores = this.get('scores');

    if(Ember.isPresent(scores)) {
        var i,
            scoresLength = scores.length,
            sortedAscending,
            numLowToDrop = 1;

        sortedAscending = this.get('sortedScores');

        for(i = 0; i < scoresLength; i++) {
            currentScoreObj = sortedAscending.objectAt(i);

            // I think this is what is causing the ember-views.render-double-modify
            Ember.set(currentScoreObj, '_droppedLow', (i < numLowToDrop));
        }

        sortedAscending.forEach((score) => {
            if( !score.get('_droppedLow') ) {
                totalScore += +score.get('points');
            }
        });
    }
    return totalScore;
}),

// had to write my own sort because scores.sortBy('points') was sorting as if 
// points were a string and not a number ?
sortedScores: Ember.computed.sort('scores.@each.points', (score1, score2) => {
    if (+score1.get('points') > +score2.get('points')) {
        return 1;
    } else if (+score1.get('points') < +score2.get('points')) {
        return -1;
    }
    return 0;
})

法官score.hbs

{{input value=score.points}}

法官score.js

import Ember from 'ember';

export default Ember.Component.extend({
    classNameBindings: [
        "score._droppedLow:droppedLow"
    ]
});

谢谢!

Answer 1

我想知道是否每次pushObject调用它都会重新触发您的计算属性？

尝试这个：

let scores = new Ember A([
  Ember.Object.create({ points: 1 }),
  Ember.Object.create({ points: 1 })
]);